《禹贡》五服制度实质是指以王城所在地为中心、从内到外可以划分为三个大圈：内圈是甸服，是王畿之地；
The essential of the Wufu system in Yu Gong is the three circles classified from inner to outer centered capital : the inner circle is Tianfu , which is capital circumference ;
甸服